Clarify Rclone instructions in docs (hestiacp#3948)

I had a similar problem as [this user](https://forum.hestiacp.com/t/rclone-configuration/10440/4), not knowing which user to run these commands as. This update makes the directions crystal clear.

Author: mredig

docs/docs/server-administration/backup-restore.md

@@ -103,7 +103,7 @@ sudo -v
 curl https://rclone.org/install.sh | sudo bash
 ```
 
-Once the download and installation is complete, run `rclone config` and then `n`. Follow the instruction on the screen, then save when completed.
+Once the download and installation is complete, run `rclone config` as the `root` user and then select the option `n`. Follow the instruction on the screen, then save when completed.
 
 To verify if it is working run as intended: